JPS55153417A - Surface acoustic wave device - Google Patents

Surface acoustic wave device

Info

Publication number
JPS55153417A
JPS55153417A JP5520879A JP5520879A JPS55153417A JP S55153417 A JPS55153417 A JP S55153417A JP 5520879 A JP5520879 A JP 5520879A JP 5520879 A JP5520879 A JP 5520879A JP S55153417 A JPS55153417 A JP S55153417A
Authority
JP
Japan
Prior art keywords
input
pitch
coupler
acoustic wave
surface acoustic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5520879A
Other languages
Japanese (ja)
Other versions
JPS5852370B2 (en
Inventor
Masaaki Ono
Noboru Wakatsuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP54055208A priority Critical patent/JPS5852370B2/en
Priority to DE8080900834T priority patent/DE3066739D1/en
Priority to PCT/JP1980/000096 priority patent/WO1980002485A1/en
Priority to US06/227,092 priority patent/US4378540A/en
Priority to EP80900834A priority patent/EP0028265B1/en
Publication of JPS55153417A publication Critical patent/JPS55153417A/en
Publication of JPS5852370B2 publication Critical patent/JPS5852370B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14517—Means for weighting
    • H03H9/1452—Means for weighting by finger overlap length, apodisation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02818—Means for compensation or elimination of undesirable effects
    • H03H9/02842—Means for compensation or elimination of undesirable effects of reflections
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6489—Compensation of undesirable effects
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02637—Details concerning reflective or coupling arrays
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/14552—Transducers of particular shape or position comprising split fingers

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

PURPOSE: To reduce TTE and spuriousness by combining the input and output transducer and multistrip coupler respectively having a given pitch.
CONSTITUTION: The one, at least, of the input and output transducers 4, 5 formed on the substrate of piezoelectric material, e.g., transducer 4 has the pitch expanded in 2/3 f0 as the used frequency f0, and desired filter characteristics 11 is formed around the frequency f0. Further, the multistop coupler 14 has the pitch of 0.3∼ 0.6 in f0/fs (where: fs is the strip band frequency). Accordingly, since the spuriousness 12 is suppressed by combining the input and output transducer and the multi- strip coupler, TTE and apuriousness can be reduced.
COPYRIGHT: (C)1980,JPO&Japio
JP54055208A 1979-05-08 1979-05-08 surface acoustic wave device Expired JPS5852370B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP54055208A JPS5852370B2 (en) 1979-05-08 1979-05-08 surface acoustic wave device
DE8080900834T DE3066739D1 (en) 1979-05-08 1980-05-07 Acoustic surface wave device
PCT/JP1980/000096 WO1980002485A1 (en) 1979-05-08 1980-05-07 Elastic surface wave apparatus
US06/227,092 US4378540A (en) 1979-05-08 1980-05-07 Acoustic surface wave device
EP80900834A EP0028265B1 (en) 1979-05-08 1980-11-17 Acoustic surface wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54055208A JPS5852370B2 (en) 1979-05-08 1979-05-08 surface acoustic wave device

Publications (2)

Publication Number Publication Date
JPS55153417A true JPS55153417A (en) 1980-11-29
JPS5852370B2 JPS5852370B2 (en) 1983-11-22

Family

ID=12992221

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54055208A Expired JPS5852370B2 (en) 1979-05-08 1979-05-08 surface acoustic wave device

Country Status (5)

Country Link
US (1) US4378540A (en)
EP (1) EP0028265B1 (en)
JP (1) JPS5852370B2 (en)
DE (1) DE3066739D1 (en)
WO (1) WO1980002485A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2870751B2 (en) * 1987-02-13 1999-03-17 株式会社東芝 Surface acoustic wave filter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803520A (en) * 1973-04-26 1974-04-09 Hughes Aircraft Co Acoustic surface wave device with improved transducer
US4075582A (en) * 1976-06-14 1978-02-21 International Business Machines Corporation Surface acoustic wave device
US4079342A (en) * 1976-09-15 1978-03-14 Sperry Rand Corporation Fanned multistrip coupler filters
JPS5399847A (en) * 1977-02-14 1978-08-31 Hitachi Ltd Elastic surface wave device

Also Published As

Publication number Publication date
JPS5852370B2 (en) 1983-11-22
EP0028265A1 (en) 1981-05-13
EP0028265B1 (en) 1984-02-29
DE3066739D1 (en) 1984-04-05
WO1980002485A1 (en) 1980-11-13
US4378540A (en) 1983-03-29
EP0028265A4 (en) 1981-10-13

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